Difference between "ray 3.0.0dev0" and "ray 1.13.0"

I have read the doc for ray 3.0.0, and found the code from ray.air import RunConfig, ScalingConfig but it gets error in ray 1.13.0, where can I find out the changes between these things?
Thanks.

Things should be cleared up once we make the Ray 2.0 release in the next couple days!

So there will be:
Ray 1.13- currently the latest Ray release
Ray 2.0- coming soon!
Ray 3.0.0.dev0- this is cutting-edge master that will continuously be updated.

The docs for Ray 1.13 are here: Welcome to the Ray documentation — Ray 1.13.0
And for master here: Welcome to the Ray documentation — Ray 3.0.0.dev0

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